Display panel or portion thereof with a graphical user interface



The sole FIGURE is a front view of a display panel or portion thereofwith a graphical user interface showing a design.

The broken line showing of a display panel or portion thereof with agraphical user interface is included for the purpose of illustratingportions of the article and forms no part of the claimed design. Theremaining broken lines illustrate portions of the graphical userinterface and the mixed reality environment, and form no part of theclaimed design.

CLAIM The ornamental design for a display panel or portion thereof witha graphical user interface, as shown and described.